EP 1668776 A1 20060614 - AUDIO PRE-AMP AND MID-BAND COMPRESSOR CIRCUIT
Title (en)
AUDIO PRE-AMP AND MID-BAND COMPRESSOR CIRCUIT
Title (de)
AUDIO-VORVERSTÄRKTER UND MITTELBAND-KOMPRESSORSCHALTUNG
Title (fr)
CIRCUIT DE PRE-AMPLIFICATION AUDIO ET DE COMPRESSION DE BANDE MOYENNE
Publication
Application
Priority
- US 2004030049 W 20040915
- US 67200403 A 20030926
Abstract (en)
[origin: US2005069155A1] An audio pre-amp and mid-band compressor circuit coupled to receive a program signal from a program signal source having a state-variable pre-amplifier responsive to a program input signal to provide a low range band-pass signal, a mid-range band-signal and a high range band-pass signal and for summing and scaling a low range band-pass signal, a mid-range band-signal and a high range band-pass signal providing a compensated signal. A voltage controlled amplifier circuit has a signal input terminal coupled to receive the compensated signal, and a control signal input coupled to receive at least a sample portion of the mid-range band-pass signal. The voltage controlled amplifier circuit responds to the amplitude of the sample portion of the mid-range band-pass signal to scale the compensated signal to provide a corrected output signal characterized to remain within a predetermined linear amplitude range at an output terminal.
IPC 1-7
IPC 8 full level
H03G 9/02 (2006.01)
CPC (source: EP US)
H03G 9/025 (2013.01 - EP US); H03F 2203/7209 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
US 2005069155 A1 20050331; CN 100539406 C 20090909; CN 1856934 A 20061101; EP 1668776 A1 20060614; EP 1668776 A4 20080402; JP 2007507166 A 20070322; WO 2005034343 A1 20050414
DOCDB simple family (application)
US 67200403 A 20030926; CN 200480027625 A 20040915; EP 04784042 A 20040915; JP 2006528053 A 20040915; US 2004030049 W 20040915